Commit Graph

221 Commits

Author SHA1 Message Date
Kyle Evans
bd6174f74c cron(8): schedule interval jobs that get loaded during execution
Jobs using the @<second> syntax currently only get executed if they exist
when cron is started. The simplest reproducer of this is:

echo '@20 root echo "Hello!"' >> /etc/cron.d/myjob

myjob will get loaded at the next second==0, but this echo job will not
run until cron restarts. These jobs are normally handled in
run_reboot_jobs(), which sets e->lastexit of INTERVAL jobs to the startup
time so they run 'n' seconds later.

Fix this by special-casing TargetTime > 0 in the database load. Preexisting
jobs will be handled at startup during run_reboot_jobs as normal, but if
we've reloaded a database during runtime we'll hit this case and set
e->lastexit to the current time when we process it. They will then run every
'n' seconds from that point, and a full restart of cron is no longer
required to make these jobs work.

Reported by:	Juraj Lutter (otis_sk.freebsd.org)
Reviewed by:	allanjude, bapt, bjk (earlier version), Juraj Lutter
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D19924
2019-04-20 02:54:20 +00:00
Kyle Evans
12455a9e31 cron(8): Add MAILFROM ability for crontabs
This changes the sender mail address in a similar fashion to how MAILTO may
change the recipient. The default from address remains unchanged.

MFC after:	1 week
2019-04-15 18:53:28 +00:00
Brad Davis
2d7bc6b39b Move etc/crontab to usr.sbin/cron/cron/
Approved by:	re (gjb), will (mentor)
Differential Revision:	https://reviews.freebsd.org/D16786
2018-09-06 14:55:54 +00:00
Warner Losh
a96081bb87 Remove old, dead compat code.
We no longer need to od these things conditionally, and the fallbacks
are to 4.2BSD era defaults, which nobody uses anymore. Vixie cron has
diverged from upstream anyway in our tree, and it's not clear there's
actually a viable upstream anymore. Plus, we don't follow the
vendor-supplied code pattern here.

I'm doing this to reduce false positives from grep.
2018-06-10 02:30:09 +00:00
Gleb Smirnoff
a08d12d3f2 Add new functionality and syntax to cron(1) to allow to run jobs at a
given interval, which is counted in seconds since exit of the previous
invocation of the job. Example user crontab entry:

@25	sleep 10

The example will launch 'sleep 10' every 35 seconds. This is a rather
useless example above, but clearly explains the functionality.

The practical goal here is to avoid overlap of previous job invocation
to a new one, or to avoid too short interval(s) for jobs that last long
and doesn't have any point of immediate launch soon after previous run.

Another useful effect of interval jobs can be noticed when a cluster of
machines periodically communicates with a single node. Running the task
time based creates too much load on the node. Running interval based
spreads invocations across machines in cluster. Note that -j/-J won't
help in this case.

Sponsored by:	Netflix
2018-06-07 22:38:40 +00:00
Kyle Evans
a97c64453d cron(8): Correct test sense
We're about to use the result of fstat(2) either way, so don't do that if it
fails...

X-MFC-With: r332429
2018-04-12 14:32:26 +00:00
Kyle Evans
1cb7491a3f cron(8): Reload database if an existing job in cron.d changed as well
Directory mtime will only change if a file is added or removed, not
modified. For /var/cron/tabs, this is fine because of how crontab(1) manages
it using temp files so all crontab(1) changes will trigger a reload of the
database.

For /etc/cron.d and /usr/local/etc/cron.d, this is not necessarily the case.
Instead of checking their mtime, we should descend into them and check mtime
on all jobs also.

Reported by:	des
Reviewed by:	bapt
MFC after:	1 week
2018-04-12 13:52:55 +00:00
Bryan Drewery
ea825d0274 DIRDEPS_BUILD: Update dependencies.
Sponsored by:	Dell EMC Isilon
2017-10-31 00:07:04 +00:00
Enji Cooper
d7938e0594 cron(8) manpage updates
- Document /etc/cron.d and /usr/local/etc/cron.d under FILES.
- Reword documentation for -n: add appropriate soft-stop and remove
  contraction to appease igor.

MFC after:	3 days
2017-07-19 19:53:07 +00:00
Enji Cooper
4555b2ad92 Fix trivial whitespace bug introduced in usage message changes for -n
support (r304570).

MFC after:	now
2017-07-19 19:38:25 +00:00
Enji Cooper
64a0982bee usr.sbin: normalize paths using SRCTOP-relative paths or :H when possible
This simplifies make logic/output

MFC after:	1 month
Sponsored by:	Dell EMC Isilon
2017-03-04 11:38:03 +00:00
Conrad Meyer
d21656dcab Add a 'force' option for non-interactive crontab removal
Add a '-f' option to force crontab '-r' to be non-interactive.

Submitted by:	Sam Gwydir <sam at samgwydir.com>
Reviewed by:	me, wblock (previous version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D8815
2016-12-20 17:12:17 +00:00
Baptiste Daroussin
569b917590 Allow symlinks to be followed in cron.d directories and fix detection of
regular files on NFS

Reported by:	jilles
2016-10-31 23:40:04 +00:00
Baptiste Daroussin
4eaecda2fa Fix typo in cron(8) date
Reported by:	jilles
2016-10-31 23:32:38 +00:00
Baptiste Daroussin
b2fd8384ff cron(8): add support for /etc/cron.d and /usr/local/etc/cron.d
For automation tools it is way easier to maintain files in directories rather
than modifying /etc/crontab.

The files in those directories are in the same format as /etc/crontab

Reviewed by:	adrian
MFC after:	2 weeks
Relnotes:	yes
Sponsored by:	Gandi.net
Differential Revision:	https://reviews.freebsd.org/D8400
2016-10-31 18:20:12 +00:00
Ed Maste
5e5d4b233a cron: use existing maximum username constant MAXLOGNAME
Previously cron had its own maximum username length limit, which was
smaller than the system's MAXLOGNAME. This could lead to crontab -u
updating the wrong user's crontab (if the name was truncated, and
matched another user).

PR:		212305
Reported by:	Andrii Kuzik
Reviewed by:	allanjude, jilles
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D7747
2016-09-02 03:15:54 +00:00
Edward Tomasz Napierala
370b58b9f8 Add the "-n" flag to cron(8), to prevent it from daemonizing.
This makes it possible to use it with external supervisors.
The "-n" flag name is compatible with Linux, NetBSD, and OpenBSD.

Reviewed by:	jilles, pfg, wblock
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D7581
2016-08-21 18:12:49 +00:00
Pedro F. Giffuni
b5635ba0a2 usr.sbin: minor spelling fixes on comments.
No functional change.
2016-05-01 16:41:25 +00:00
Pedro F. Giffuni
e78e0c43ba crontab: ftruncate() with ftello() instead of ftell().
Obtained from:	OpenBSD (CVS rev. 1.47)
2016-02-16 21:19:39 +00:00
Pedro F. Giffuni
b83c6ff578 cron: use (char *)NULL instead of (char *)0 in execle.
Obtained from:	OpenBSD (CVS Rev 1.25)
2016-02-16 20:59:49 +00:00
Jilles Tjoelker
43d53dba8f Add sbin and /usr/local directories to _PATH_DEFPATH.
Set _PATH_DEFPATH to
/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin. This is the
path in the default class in the default /etc/login.conf,
excluding ~/bin which would not be expanded properly in a string
constant.

For normal logins, _PATH_DEFPATH is overridden by /etc/login.conf,
~/.login_conf or shell startup files. _PATH_DEFPATH is still used as a
default by execlp(), execvp(), posix_spawnp() and sh if PATH is not set, and
by cron. Especially the latter is a common trap (most recently in PR
204813).

PR:		204813
Reviewed by:	secteam (delphij), alfred
2016-01-05 16:21:20 +00:00
Pedro F. Giffuni
587d674e16 Undo change from r292607 that was not meant to be there
Pointyhat: me
2015-12-22 15:42:53 +00:00
Pedro F. Giffuni
d985028157 cron: Check the return value of pipe(2)
Fix inspired by:	OpenBSD (rev 1.56)
CID:	1009830
2015-12-22 15:32:45 +00:00
Pedro F. Giffuni
7044922b39 crontab: properly free an entry
This should close memory leak.

Obtained from:	OpenBSD (rev. 1.62)
CID:		271773
2015-12-22 15:30:26 +00:00
Pedro F. Giffuni
c28c984689 crontab: replace malloc + bzero with calloc
Obtained from:	OpenBSD (Rev 1.20)
2015-12-22 15:20:08 +00:00
Simon J. Gerraty
ccfb965433 Add META_MODE support.
Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp
2015-06-13 19:20:56 +00:00
Simon J. Gerraty
44d314f704 dirdeps.mk now sets DEP_RELDIR 2015-06-08 23:35:17 +00:00
Simon J. Gerraty
98e0ffaefb Merge sync of head 2015-05-27 01:19:58 +00:00
Baptiste Daroussin
a7f8c4eb4c Readd Makefile.inc that were used to include upper level Makefile.inc and
set (among other things) the destination where the binary should be installed
2014-11-28 22:03:35 +00:00
Baptiste Daroussin
c6db8143ed Convert usr.sbin to LIBADD
Reduce overlinking
2014-11-25 16:57:27 +00:00
Simon J. Gerraty
9268022b74 Merge from head@274682 2014-11-19 01:07:58 +00:00
Bryan Drewery
5608fd23c2 Revert r267233 for now. PIE support needs to be reworked.
1. 50+% of NO_PIE use is fixed by adding -fPIC to INTERNALLIB and other
   build-only utility libraries.
2. Another 40% is fixed by generating _pic.a variants of various libraries.
3. Some of the NO_PIE use is a bit absurd as it is disabling PIE (and ASLR)
   where it never would work anyhow, such as csu or loader. This suggests
   there may be better ways of adding support to the tree. Many of these
   cases can be fixed such that -fPIE will work but there is really no
   reason to have it in those cases.
4. Some of the uses are working around hacks done to some Makefiles that are
   really building libraries but have been using bsd.prog.mk because the code
   is cleaner. Had they been using bsd.lib.mk then NO_PIE would not have
   been needed.

We likely do want to enable PIE by default (opt-out) for non-tree consumers
(such as ports). For in-tree though we probably want to only enable PIE
(opt-in) for common attack targets such as remote service daemons and setuid
utilities. This is also a great performance compromise since ASLR is expected
to reduce performance. As such it does not make sense to enable it in all
utilities such as ls(1) that have little benefit to having it enabled.

Reported by:	kib
2014-08-19 15:04:32 +00:00
Simon J. Gerraty
ee7b0571c2 Merge head from 7/28 2014-08-19 06:50:54 +00:00
Peter Wemm
713c03d57a Check gethostname(2) return code - but even if it succeeds it may not
null terminate.

Temporarily use "From: $user@$hostname" rather than "From: $user".
The latter exposes incompatible behavior if using dma(8).  sendmail(8)
(and other alternatives) canonify either form on submission (even
if masquerading), but dma will leak a non-compliant address to
the internet.
2014-08-05 01:32:09 +00:00
Baptiste Daroussin
01c2b8ac0d use .Mt to mark up email addresses consistently (part2)
PR:		191174
Submitted by:	Franco Fichtner  <franco@lastsummer.de>
2014-06-20 09:57:27 +00:00
Bryan Drewery
864c53ead8 In preparation for ASLR [1] support add WITH_PIE to support building with -fPIE.
This is currently an opt-in build flag. Once ASLR support is ready and stable
it should changed to opt-out and be enabled by default along with ASLR.

Each application Makefile uses opt-out to ensure that ASLR will be enabled by
default in new directories when the system is compiled with PIE/ASLR. [2]

Mark known build failures as NO_PIE for now.

The only known runtime failure was rtld.

[1] http://www.bsdcan.org/2014/schedule/events/452.en.html
Submitted by:		Shawn Webb <lattera@gmail.com>
Discussed between:	des@ and Shawn Webb [2]
2014-06-08 17:29:31 +00:00
Simon J. Gerraty
fae50821ae Updated dependencies 2014-05-16 14:09:51 +00:00
Simon J. Gerraty
76b28ad6ab Updated dependencies 2014-05-10 05:16:28 +00:00
Simon J. Gerraty
3b8f084595 Merge head 2014-04-28 07:50:45 +00:00
Andrey A. Chernov
bc36ff9bc7 Bad timespec_subtract() calculations produce negative tv_nsec on i386
which cause EINVAL returned from nanosleep() which cause loop in
cron_sleep() and making all cron jobs to start about 30 seconds earlier
(which cause f.e. logfiles rotation by newsyslog delayed by 1 hour).

Use simple and proved calculations from kernel's timespecsub() instead.

MFC after:      3 days
2014-01-25 02:16:09 +00:00
Simon J. Gerraty
7cf3a1c6b2 Updated dependencies 2013-03-11 17:21:52 +00:00
Simon J. Gerraty
f5f7c05209 Updated dependencies 2013-02-16 01:23:54 +00:00
Simon J. Gerraty
23090366f7 Sync from head 2012-11-04 02:52:03 +00:00
Maxim Sobolev
7a5c30c5b6 Second attempt to add @every_second keyword support. Due to multiple
requests, default to the previous 60-seconds scheduling method
unless there is any @every_second entries to conserve CPU cycles and
power.

This change also improves scheduling in the default mode by running
as close to the beginning of the minnute as possible by replacing
sleep(3) with nanosleep(2). Previously, the tasks would run anywhere
within the first second of the minute and that offset drifted back
and forth each time cron(8) was engaged.

MFC after:	1 month
2012-10-25 22:54:29 +00:00
Maxim Sobolev
27858d0bb4 Fully backout latest changes.
Pointy hat to:	sobomax
2012-10-18 06:27:03 +00:00
Maxim Sobolev
8675ac22d6 Remove harmless, but superfluous local change that creeped in along
with the r241649.
2012-10-17 21:26:35 +00:00
Maxim Sobolev
07e9aac098 Revert latest changes to cron, until better version is worked out (I hope).
Requested by:   few
2012-10-17 20:45:48 +00:00
Maxim Sobolev
7bd028861b o Use nanosleep(2) to sleep exact amount of time till the next second,
not multiple of 1 second, which results in actual time to drift back
and forth every run within 1 second of the actual action has
been set for.

Suggested by:   Ian Lepore

o Schedule the first run in 1 second after starting up, not on the
boundary of the next minute, which results in the every_second jobs
not being run.
2012-10-17 00:44:34 +00:00
Maxim Sobolev
890278c188 Properly handle non-keyword case by setting e->second to 0. 2012-10-16 21:34:02 +00:00
Maxim Sobolev
2543786a37 Add per-second scheduling into the cron(8). Right now it's
only available via the new @every_second shortcut. ENOTIME to
implement crontab(5) format extensions to allow more flexible
scheduling.

In order to address some concerns expressed by Terry Lambert
while discussing the topic few years ago, about per-second cron
possibly causing some bad effects on /etc/crontab by stat()ing
it every second instead of every minute now (i.e. atime update),
only check that database needs to be reloaded on every 60-th
loop run. This should be close enough to the current behaviour.

Add "@every_minute" shortcut while I am here.

MFC after:	1 month
2012-10-15 08:21:49 +00:00